Page:An introduction to linear drawing.djvu/84

65 ﻿Perspective plane, begin with the base line C D and the horizontal line A B. Take Ethe corner of the building nearest to the spectator's eye, and draw the line E B for the bottom of one side of the building.

Then, to find the Vanishing point of the lines of the other side, from the Centre of the picture, which you may fix at F, draw the perpendicular F G equal to the Distance of the picture. Then draw the line G A at right angles to G B, and the point A, in which it cuts the horizontal line, will be the vanishing point of the other side of the building. To this point, therefore, draw the line E A for the bottom of this side of the building.

In order to find the apparent width of each side, it is necessary to have a distance point for each side. Take the space from A to I, equal in length to the line A G, the point I being the distance point of the side E A. In like manner with the distance B G mark the space B H on the horizontal line, the point H being the distance point of the side E B. On the base line measure the space E C equal to the real width of the side E A, and from the point C draw a line to the distance point I, which, cutting the line E A at L, will give the space L E, the perspective width of that side. In like manner measure off E D the real width of the other side, draw the line D H, and the space E N is the perspective width of this side.

From the corner E erect the perpendicular E M, the actual height of the house ; draw the line M A for the top of the building; raise a perpendicular on the point L till it strikes the line M A at K, and you have one front of the building completed. Do the same by the other side and you have M E O N, the other front.

Cross two diagonals to find the centre of the gable end near I. Carry the perpendicular E M to P, the real height of the point of the gable end. Draw the line P B, raise a perpendicular on the centre of the gable